75W-85 in place of 75W-90

The reason I am asking is the vehicle is used for short trips only (15 miles or less). Not sure if there's any benefit in using thicker grades.
 
It would help if we knew -

Where you lived.
How you drive it.
What the vehicle is.
What the oil is.

I am not based in USA. The climate in my city is on average is mild. The only hot months are May-July when temperature cross 40C. The December and January are the two most coldest months with temperatures between 0C-5C (at night). Rest of the year stays mild.

I mostly do short trips with 15 miles or less.
I have not decided the oil yet.
 
Yes depend on case.
Really any 75w90 works most time as 75w85 or even thick 75w80, if you new 75w85 is better quality or more stable it could be even better. In your case I'd consider 75w85.
 
I am not based in USA. The climate in my city is on average is mild. The only hot months are May-July when temperature cross 40C. The December and January are the two most coldest months with temperatures between 0C-5C (at night). Rest of the year stays mild.

I mostly do short trips with 15 miles or less.
I have not decided the oil yet.
Vehicle?
 
75W90 is generally synthetic, 75W85 is generally not. “Can” you use it? Yes. “Should” you use it? Depends…
What??? Pretty sure there are plenty of 75w-85 synthetics. Can you name some non-synthetics? I don’t pay attention to everything, so maybe you have a valid point, though perhaps overstated. Redline, HPL make 75w85….i presume synthetic. I THINK Motorcraft 75w-85 is full synthetic. If you are hung up on GrpIV vs III, then maybe the Motorcraft drops out. I have no knowledge of AC Delco/GM, Toyota or FCA. And maybe you aren’t asking about gear oil per se (vs MT or transfer case fluid?)

I will say, the 2nd half of your statement makes more sense…though opposite of what OP was asking about: say you bought a vehicle with factory 75w-85: should you replace with 75w-90? I wish I had been more effective trying to convince @SubieRubyRoo to include Motorcraft 75w-85 in his Mega 75w-90 comparison tests.
 
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The vehicle is Seres 3 EV. The owners manual state 75W-90 GL-4 should be used as a reducer oil.
Think of reducer as single speed transmission in EVs.

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Seres is a Chinese-American company. You can read more here
https://en.wikipedia.org/wiki/Seres_(automobiles)
They don't sell vehicles in US at the moment.
 
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